Development of No-Insulation Racetrack Coils Wound With 2nd Generation HTS Tapes for a Stator System for Wind Generators

摘要

With the high current carrying capacity of second generation superconductors the increase of power density of electrical devices is a main research subject in the field of superconductors application. Especially, compact and more lightweight generators in offshore wind turbines would result in a reduction of the levelized cost of energy. To avoid the use of cryogenic liquids and reach temperatures below 77 & x00A0;K a conduction cooling method for keeping the coils at their operating temperature is envisaged. Furthermore, the possibility of an increased thermal and electrical stability of coils without a turn-to-turn insulation could make the need of a complicated and sensible quench protection system redundant. To expedite the use of such coils in a real power application the design and construction of a 10 & x00A0;kW laboratory generator demonstrator is set as an objective. Therefore, a pancake racetrack coil is designed for the usage in the stator system of such a demonstrator and wound without any insulation between the turns. The performance of this coil, especially under conduction cooled conditions below 77 & x00A0;K, is investigated. The first results in terms of effectiveness of the cooling system, recording the typical parameters of no-insulation coils and investigating the thermal and electrical behavior at dynamic load situations is presented.